FROM node:22-slim

RUN apt-get update && apt-get install -y --no-install-recommends \
    chromium \
    fonts-freefont-ttf \
    fonts-noto-cjk \
    tini \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

COPY package.json package-lock.json ./
RUN npm ci --omit=dev

COPY convert.js server.js md2html.js mermaid.min.js ./

ENV CHROME_PATH=/usr/bin/chromium
ENV PORT=3000

EXPOSE 3000

HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000/health', r => process.exit(r.statusCode === 200 ? 0 : 1))"

ENTRYPOINT ["/usr/bin/tini", "--"]
CMD ["node", "server.js"]